android - FMX 形状组件在 Android 平台上显示不正确

Question

可以看到，形状组件在Windows平台上显示正常，非常流畅(包括线条、角和渐变效果)。

但在Android平台上，你会得到另一个 Not Acceptable 结果:线条不再平滑，角落无法闭合，渐变变成全黑。

这是怎么发生的？以及如何解决？

这是 .fmx 文件内容:

object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 480
  ClientWidth = 640
  FormFactor.Width = 320
  FormFactor.Height = 480
  FormFactor.Devices = [Desktop]
  DesignerMasterStyle = 0
  object RoundRect1: TRoundRect
    Position.X = 40.000000000000000000
    Position.Y = 16.000000000000000000
    Size.Width = 153.000000000000000000
    Size.Height = 65.000000000000000000
    Size.PlatformDefault = False
    Stroke.Color = claMediumslateblue
    Stroke.Thickness = 8.000000000000000000
  end
  object Pie1: TPie
    Position.X = 32.000000000000000000
    Position.Y = 96.000000000000000000
    Size.Width = 153.000000000000000000
    Size.Height = 129.000000000000000000
    Size.PlatformDefault = False
    Stroke.Color = claChocolate
    Stroke.Thickness = 8.000000000000000000
    EndAngle = -90.000000000000000000
  end
  object Arc1: TArc
    Position.X = 48.000000000000000000
    Position.Y = 224.000000000000000000
    Size.Width = 169.000000000000000000
    Size.Height = 161.000000000000000000
    Size.PlatformDefault = False
    Stroke.Color = claDeeppink
    Stroke.Thickness = 10.000000000000000000
    StartAngle = 30.000000000000000000
    EndAngle = 180.000000000000000000
  end
  object Arc2: TArc
    Position.X = 16.000000000000000000
    Position.Y = 184.000000000000000000
    Size.Width = 233.000000000000000000
    Size.Height = 233.000000000000000000
    Size.PlatformDefault = False
    Stroke.Kind = Gradient
    Stroke.Gradient.Points = <
      item
        Color = xFF297E72
        Offset = 0.000000000000000000
      end
      item
        Color = xFFA6F2BD
        Offset = 1.000000000000000000
      end>
    Stroke.Gradient.StartPosition.X = 0.500000000000000000
    Stroke.Gradient.StartPosition.Y = 1.000000000000000000
    Stroke.Gradient.StopPosition.X = 0.499999970197677600
    Stroke.Gradient.StopPosition.Y = 0.000000000000000000
    Stroke.Thickness = 20.000000000000000000
    Stroke.Cap = Round
    EndAngle = -90.000000000000000000
  end
end

Answer 1

我相信文档中说的 Strokes(线条)上的渐变除了 Windows 2D 渲染外不起作用。但是我找不到它说的地方。如果您希望 Windows 版本使用 3D，您可以这样做:

initialization
FMX.Types.GlobalUseGPUCanvas := True;

您还可以通过 overriding the rendering parameters 开启多重采样.最后你可以使用 native Android component如果需要，可以使用原生绘图。